upgrade versions of some tools

Node.js: 0.8.x -> 0.10.x
Ruby: 1.9.3 -> 2.0.0
yo: 1.0.0-beta.4 -> 1.0.0-beta.6
grunt-cli: 0.1.6 -> 0.1.9
bower: 0.8.6 -> 0.9.2